Inversion formula with hypergeometric polynomials and its application to an integral equation
(1904.08283)Abstract
For any complex parameters $x$ and $\nu$, we provide a new class of linear inversion formulas $T = A(x,\nu) \cdot S \Leftrightarrow S = B(x,\nu) \cdot T$ between sequences $S = (Sn){n \in \mathbb{N}*}$ and $T = (Tn){n \in \mathbb{N}*}$, where the infinite lower-triangular matrix $A(x,\nu)$ and its inverse $B(x,\nu)$ involve Hypergeometric polynomials $F(\cdot)$, namely $$ \left{ \begin{array}{ll} A{n,k}(x,\nu) = \displaystyle (-1)k\binom{n}{k}F(k-n,-n\nu;-n;x), \ B{n,k}(x,\nu) = \displaystyle (-1)k\binom{n}{k}F(k-n,k\nu;k;x) \end{array} \right. $$ for $1 \leqslant k \leqslant n$. Functional relations between the ordinary (resp. exponential) generating functions of the related sequences $S$ and $T$ are also given. These new inversion formulas have been initially motivated by the resolution of an integral equation recently appeared in the field of Queuing Theory; we apply them to the full resolution of this integral equation. Finally, matrices involving generalized Laguerre polynomials polynomials are discussed as specific cases of our general inversion scheme.
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